CPC G01N 21/39 (2013.01) [G01N 21/41 (2013.01); G01N 2021/399 (2013.01)] | 13 Claims |
1. A method of determining a concentration of at least one gas in a container, the method comprising:
transmitting light from a light source through a volume of the at least one gas located inside the container;
detecting light reflected by a surface inside or behind the container, or light refracted or scattered by the container, with a detector, wherein the detector comprises a position sensitive detector (PSD) and is configured to provide a first signal related to an intensity of the light reflected by the surface or light refracted or scattered by the container, and a second signal related to a position of reflected, refracted or scattered light being detected;
determining an absorption of the at least one gas inside the container based on the first signal;
determining a distance that light travels through said container based on the second signal; and
estimating a concentration of the at least one gas inside the container, based on the absorption and the distance.
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